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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt VS Tools.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#region Task TaskName="CriticalSection"
#region Using
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using Microsoft.Build.Framework;
using Microsoft.Win32;
#endregion
#region Comment
/////////////////////////////////////////////////////////////////////////////////////////////////
/// TASK CriticalSection
/////////////////////////////////////////////////////////////////////////////////////////////////
// Enter or leave a critical section during build
// Parameters:
// in bool Lock: 'true' when entering the critical section, 'false' when leaving
// in string Name: Critical section lock name
#endregion
namespace QtVsTools.QtMsBuild.Tasks
{
public static class CriticalSection
{
public static QtMSBuild.ITaskLoggingHelper Log { get; set; }
public static IBuildEngine BuildEngine { get; set; }
public static bool Execute(
#region Parameters
System.Boolean Lock,
System.String Name)
#endregion
{
#region Code
var buildEngine = BuildEngine as IBuildEngine4;
// Acquire lock
string lockName = string.Format("Global\\{0}", Name);
EventWaitHandle buildLock = null;
if (!EventWaitHandle.TryOpenExisting(lockName, out buildLock)) {
// Lock does not exist; create lock
bool lockCreated;
buildLock = new EventWaitHandle(
true, EventResetMode.AutoReset, lockName, out lockCreated);
if (lockCreated) {
// Keep lock alive until end of build
buildEngine.RegisterTaskObject(
Name, buildLock, RegisteredTaskObjectLifetime.Build, false);
}
}
if (buildLock == null) {
Log.LogError("Qt::BuildLock[{0}]: Error accessing lock", Name);
return false;
}
if (Lock) {
// Wait until locked
if (!buildLock.WaitOne(1000)) {
var t = Stopwatch.StartNew();
do {
// Check for build errors
if (Log.HasLoggedErrors) {
Log.LogError("Qt::BuildLock[{0}]: Errors logged; wait aborted", Name);
return false;
}
// Timeout after 10 secs.
if (t.ElapsedMilliseconds >= 10000) {
Log.LogError("Qt::BuildLock[{0}]: Timeout; wait aborted", Name);
return false;
}
} while (!buildLock.WaitOne(1000));
}
} else {
// Unlock
buildLock.Set();
}
#endregion
return true;
}
}
}
#endregion
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